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Distribution function of dark matter with constant anisotropy
Ma, Ding; He, Ping; Ma, D , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
2008
发表期刊INTERNATIONAL JOURNAL OF MODERN PHYSICS D
ISSN0218-2718
卷号17期号:8页码:1283-1294
摘要N-body simulations of dark matter halos show that the density is cusped near the center of the halo. The density pro. le behaves as r(-gamma). in the inner parts, where gamma similar or equal to 1 for the NFW model and gamma similar or equal to 1.5 for the Moore model, but in the outer parts the two models agree with each other in the asymptotic behavior of the density profile. The simulations also show information about the anisotropy parameter beta(r) of the velocity distribution: beta approximate to 0 in the inner part and beta approximate to 0.5 (radially anisotropic) in the outer part of the halo. We provide some distribution functions F(E, L) with the constant anisotropy parameter beta for the two spherical models of dark matter halos: a new generalized NFW model and a generalized Moore model. There are two parameters alpha and epsilon for those two generalized models to determine the asymptotic behavior of the density pro. le. In this paper, we concentrate on the situation of beta(r) = 1/2 from the viewpoint of the simulation.
部门归属[Ma, D; He, P] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Spherical Stellar-systems 2-integral Distribution-functions Central Black-hole Dynamical Models Density Profiles Velocity Distributions Analytical Family Hernquist Models Galaxies Stability
学科领域Physics
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收录类别SCI
WOS记录号WOS:000259047300010
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5497
专题理论物理所SCI论文
通讯作者Ma, D , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
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Ma, Ding,He, Ping,Ma, D , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China. Distribution function of dark matter with constant anisotropy[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D,2008,17(8):1283-1294.
APA Ma, Ding,He, Ping,&Ma, D , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.(2008).Distribution function of dark matter with constant anisotropy.INTERNATIONAL JOURNAL OF MODERN PHYSICS D,17(8),1283-1294.
MLA Ma, Ding,et al."Distribution function of dark matter with constant anisotropy".INTERNATIONAL JOURNAL OF MODERN PHYSICS D 17.8(2008):1283-1294.
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